IMO, Frederik of Denmark is too short and a bit too "pretty." I much prefer the sexy masculinity of Prince William of Wales; Prince Philip of Spain is also very attractive. If we were to include young men from non-reigning houses, the sons of Carl-Christian of Austria and Marie-Astrid of Luxembourg would have to be among the handsomest.

This is an interesting poll and for me I think there needs to be careful thought between the idea of good looking and sexy. For example, Prince William has better looks than Prince Harry, but I do feel somehow that Harry's personality and character in a private situation might be sexier that William's...
It's so hard to answer this poll because it's hard to associate "sexy" with the majesty of royalty!!!